MXPA02000298A - Polimerizacion de oxidos de alquileno utilizando catalizadores de cianuro metalico y compuestos iniciadores no saturados. - Google Patents
Polimerizacion de oxidos de alquileno utilizando catalizadores de cianuro metalico y compuestos iniciadores no saturados.Info
- Publication number
- MXPA02000298A MXPA02000298A MXPA02000298A MXPA02000298A MXPA02000298A MX PA02000298 A MXPA02000298 A MX PA02000298A MX PA02000298 A MXPA02000298 A MX PA02000298A MX PA02000298 A MXPA02000298 A MX PA02000298A MX PA02000298 A MXPA02000298 A MX PA02000298A
- Authority
- MX
- Mexico
- Prior art keywords
- carbon
- oxide
- alkylene oxide
- process according
- group
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G65/00—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule
- C08G65/02—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring
- C08G65/26—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring from cyclic ethers and other compounds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G65/00—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule
- C08G65/02—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring
- C08G65/26—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring from cyclic ethers and other compounds
- C08G65/2642—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring from cyclic ethers and other compounds characterised by the catalyst used
- C08G65/2645—Metals or compounds thereof, e.g. salts
- C08G65/2663—Metal cyanide catalysts, i.e. DMC's
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J27/00—Catalysts comprising the elements or compounds of halogens, sulfur, selenium, tellurium, phosphorus or nitrogen; Catalysts comprising carbon compounds
- B01J27/24—Nitrogen compounds
- B01J27/26—Cyanides
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G65/00—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule
- C08G65/02—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring
- C08G65/26—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring from cyclic ethers and other compounds
- C08G65/2603—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring from cyclic ethers and other compounds the other compounds containing oxygen
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G65/00—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule
- C08G65/02—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring
- C08G65/26—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring from cyclic ethers and other compounds
- C08G65/2603—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring from cyclic ethers and other compounds the other compounds containing oxygen
- C08G65/2606—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring from cyclic ethers and other compounds the other compounds containing oxygen containing hydroxyl groups
- C08G65/2609—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring from cyclic ethers and other compounds the other compounds containing oxygen containing hydroxyl groups containing aliphatic hydroxyl groups
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G65/00—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule
- C08G65/02—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring
- C08G65/26—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring from cyclic ethers and other compounds
- C08G65/2618—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring from cyclic ethers and other compounds the other compounds containing nitrogen
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G65/00—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule
- C08G65/02—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring
- C08G65/26—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring from cyclic ethers and other compounds
- C08G65/2642—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring from cyclic ethers and other compounds characterised by the catalyst used
- C08G65/2693—Supported catalysts
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G65/00—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule
- C08G65/02—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring
- C08G65/26—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring from cyclic ethers and other compounds
- C08G65/2696—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring from cyclic ethers and other compounds characterised by the process or apparatus used
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Toxicology (AREA)
- General Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Polyethers (AREA)
Applications Claiming Priority (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US14308199P | 1999-07-09 | 1999-07-09 | |
US14307599P | 1999-07-09 | 1999-07-09 | |
US14308299P | 1999-07-09 | 1999-07-09 | |
US14307899P | 1999-07-09 | 1999-07-09 | |
US14307999P | 1999-07-09 | 1999-07-09 | |
US20577200P | 2000-05-19 | 2000-05-19 | |
PCT/US2000/018620 WO2001004178A1 (fr) | 1999-07-09 | 2000-07-07 | Polymerisation d'oxydes d'alkylene faisant appel a des catalyseurs au cyanure metallique et a des composes d'amorce insatures |
Publications (1)
Publication Number | Publication Date |
---|---|
MXPA02000298A true MXPA02000298A (es) | 2002-06-21 |
Family
ID=27558276
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
MXPA02000298A MXPA02000298A (es) | 1999-07-09 | 2000-07-07 | Polimerizacion de oxidos de alquileno utilizando catalizadores de cianuro metalico y compuestos iniciadores no saturados. |
Country Status (14)
Country | Link |
---|---|
US (1) | US6355845B1 (fr) |
EP (1) | EP1214368B1 (fr) |
JP (1) | JP2003534392A (fr) |
KR (1) | KR20020030779A (fr) |
CN (1) | CN100391999C (fr) |
AR (1) | AR025851A1 (fr) |
AT (1) | ATE411350T1 (fr) |
AU (1) | AU5788500A (fr) |
BR (1) | BR0011792A (fr) |
CA (1) | CA2376034A1 (fr) |
CO (1) | CO5160376A1 (fr) |
DE (1) | DE60040549D1 (fr) |
MX (1) | MXPA02000298A (fr) |
WO (1) | WO2001004178A1 (fr) |
Families Citing this family (35)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6429166B1 (en) * | 2000-05-19 | 2002-08-06 | Dow Global Technologies Inc. | Method for preparing metal cyanide catalyst/polyol initiator slurries |
US20020091219A1 (en) * | 2001-01-08 | 2002-07-11 | Clement Katherine Sue | Certain silicone polyethers, methods for making them and uses |
US6977236B2 (en) * | 2002-06-14 | 2005-12-20 | Shell Oil Company | Preparation of a double metal cyanide catalyst |
US6716788B2 (en) | 2002-06-14 | 2004-04-06 | Shell Oil Company | Preparation of a double metal cyanide catalyst |
DE10243366A1 (de) * | 2002-09-18 | 2004-04-01 | Basf Ag | Herstellung von Alkoxylaten bei optimierten Reaktionsdrücken |
JP3990365B2 (ja) * | 2004-02-20 | 2007-10-10 | 埼玉日本電気株式会社 | 折り畳み式電子機器 |
MX221601B (en) * | 2004-05-14 | 2004-07-22 | Basf Ag | Functional fluids containing alkylene oxide copolymers having low pulmonary toxicity |
DE602005023759D1 (de) * | 2004-10-25 | 2010-11-04 | Dow Global Technologies Inc | Polymerpolyole und polymerdispersionen aus hydroxylhaltigen materialien auf pflanzenölbasis |
CA2578848A1 (fr) * | 2004-10-25 | 2006-05-04 | Dow Global Technologies Inc. | Dossiers de tapis en polyurethanne produits a partir de polyols de polyester hydroxymethyles |
WO2006047434A1 (fr) * | 2004-10-25 | 2006-05-04 | Dow Global Technologies, Inc. | Prepolymeres a base de polyols de polyester contenant de l'hydroxymethyle derives d'acides gras |
CN101048436B (zh) * | 2004-10-25 | 2011-07-06 | 陶氏环球技术公司 | 由源于脂肪酸的含羟甲基的聚酯多元醇制成的含水聚氨酯分散体 |
KR101298387B1 (ko) * | 2004-10-25 | 2013-08-20 | 다우 글로벌 테크놀로지스 엘엘씨 | 히드록시메틸 함유 지방산 또는 상기 지방산의 알킬에스테르로부터 제조된 폴리우레탄 |
DE102005012794A1 (de) * | 2005-03-19 | 2006-09-21 | Bayer Materialscience Ag | Poly(etherester)polyole und Verfahren zu ihrer Herstellung |
DE102005020347A1 (de) * | 2005-05-02 | 2006-11-09 | Basf Ag | Verfahren zur Herstellung von Doppelmetallcyanidkomplex-Katalysatoren |
US20080132729A1 (en) | 2006-12-01 | 2008-06-05 | Mcdaniel Kenneth G | Continuous process for the production of ethoxylates |
US7473677B2 (en) * | 2007-04-16 | 2009-01-06 | Bayer Materialscience Llc | High productivity process for alkylphenol ethoxylates |
US20080255378A1 (en) * | 2007-04-16 | 2008-10-16 | Bayer Materialscience Llc | High productivity process for non-phenolic ethoxylates |
EP2209827B1 (fr) | 2007-11-14 | 2016-05-25 | Basf Se | Mousses de polyuréthanes ayant des propriétés améliorées d'endurance à la flexion |
EP2408841B1 (fr) | 2009-03-17 | 2014-11-19 | Basf Se | Corps moulé en polyuréthanne présentant une résistance améliorée à la propagation d'une déchirure et un meilleur comportement en fatigue par flexion |
KR20120045007A (ko) | 2009-07-20 | 2012-05-08 | 바스프 에스이 | 점탄성의 연질 폴리우레탄 발포체의 제조방법 |
JP2013506727A (ja) | 2009-09-30 | 2013-02-28 | ビーエーエスエフ ソシエタス・ヨーロピア | アルコキシル化されたポリマー |
KR20120103684A (ko) | 2009-12-11 | 2012-09-19 | 바스프 에스이 | 치수적으로 안정한 폴리우레탄 발포 성형체 |
WO2012098145A1 (fr) | 2011-01-21 | 2012-07-26 | Basf Se | Mousses microcellulaires possédant des propriétés mécaniques améliorées |
US20140235127A1 (en) | 2013-02-21 | 2014-08-21 | Henkel Corporation | Elastic attachment adhesive and use thereof |
CN109563260B (zh) * | 2016-06-30 | 2021-10-15 | 陶氏环球技术有限责任公司 | 用于制备聚醚二醇的方法 |
PT3596148T (pt) | 2017-03-16 | 2021-07-27 | Basf Se | Processo para a produção de botas de poliuretano |
MX2020001347A (es) | 2017-07-31 | 2020-08-31 | P2 Science Inc | Derivados de polieteres, usos y medotos de preparacion de los mismos. |
US12084543B2 (en) | 2018-03-07 | 2024-09-10 | P2 Science, Inc. | Polyether derivatives, uses, and methods of making the same |
US11872300B2 (en) | 2020-03-05 | 2024-01-16 | P2 Science, Inc. | Cosmetic compositions comprising polyether polymers |
EP4185628A1 (fr) | 2020-07-24 | 2023-05-31 | Basf Se | Structure multicouche et son procédé de préparation |
CN113201128B (zh) * | 2021-03-09 | 2022-12-09 | 中国科学院过程工程研究所 | 一种用于环氧化合物开环聚合的引发剂 |
US12209069B2 (en) | 2021-05-17 | 2025-01-28 | P2 Science, Inc. | Fatty acid terpene alcohol esters |
US12215120B1 (en) | 2021-05-17 | 2025-02-04 | P2 Science, Inc. | Terpene O-glycosides |
EP4448704A1 (fr) | 2021-12-16 | 2024-10-23 | Dow Global Technologies LLC | Nouveaux tensioactifs non ioniques et leurs procédés de fabrication |
WO2024227678A1 (fr) | 2023-05-02 | 2024-11-07 | Basf Se | Moulages en mousse de polyuréthane de faible densité à peau lisse |
Family Cites Families (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3021341A (en) | 1960-02-23 | 1962-02-13 | Miles Lab | Methylene dioxanes |
US3427335A (en) | 1963-02-14 | 1969-02-11 | Gen Tire & Rubber Co | Double metal cyanides complexed with an acyclic aliphatic saturated monoether,an ester and a cyclic ether and methods for making the same |
US3427334A (en) | 1963-02-14 | 1969-02-11 | Gen Tire & Rubber Co | Double metal cyanides complexed with an alcohol aldehyde or ketone to increase catalytic activity |
US3291607A (en) | 1965-05-28 | 1966-12-13 | Gen Aniline & Film Corp | Water-soluble polyoxyalkylenated butyne-2-diol-1, 4 development accelerators |
GB1245943A (en) | 1968-08-08 | 1971-09-15 | Ici Ltd | Polyoxyalkylene derivatives |
US3829505A (en) | 1970-02-24 | 1974-08-13 | Gen Tire & Rubber Co | Polyethers and method for making the same |
US4053422A (en) | 1976-06-16 | 1977-10-11 | Texaco Inc. | Drilling fluids containing polyethoxylated tetraalkyl acetylenic diols |
JPS5764629A (en) * | 1980-10-03 | 1982-04-19 | Continental Oil Co | Alkoxylation of unsaturated alcohols |
US4843054A (en) | 1987-02-26 | 1989-06-27 | Arco Chemical Technology, Inc. | Preparation of filterable double metal cyanide complex catalyst for propylene oxide polymerization |
JP2995568B2 (ja) * | 1989-05-09 | 1999-12-27 | 旭硝子株式会社 | ポリアルキレンオキシド誘導体の製造法 |
JP2636954B2 (ja) * | 1989-08-15 | 1997-08-06 | 日信化学工業株式会社 | アセチレングリコールのプロピレンオキサイド付加物及びその製造方法 |
JPH05209052A (ja) * | 1991-07-19 | 1993-08-20 | Asahi Glass Co Ltd | ポリエーテルマクロマーおよびその重合体 |
US5382642A (en) | 1993-07-28 | 1995-01-17 | Arco Chemical Technology, L.P. | Copolymers of allyl alcohol propoxylates and vinyl aromatic monomers |
US5451652A (en) | 1994-04-28 | 1995-09-19 | Arco Chemical Technology, L.P. | Polymers from propoxylated allyl alcohol |
JP3981162B2 (ja) | 1994-07-18 | 2007-09-26 | 旭硝子株式会社 | ポリエーテルの製造方法 |
JPH08208426A (ja) | 1995-02-03 | 1996-08-13 | Nippon Oil & Fats Co Ltd | 化粧品基材 |
US5856369A (en) | 1996-07-30 | 1999-01-05 | Osi Specialties, Inc. | Polyethers and polysiloxane copolymers manufactured with double metal cyanide catalysts |
US5786514A (en) | 1996-12-18 | 1998-07-28 | Arco Chemical Technology, L.P. | Process for alkoxylating carbonyl-functionalized phenols using double metal cyanide catalysts |
US5854386A (en) * | 1997-08-25 | 1998-12-29 | Arco Chemical Technology, L.P. | Stabilizers for polymer polyols |
TW515811B (en) | 1997-08-25 | 2003-01-01 | Arco Chem Tech | Preparation of functionalised polyethers |
-
2000
- 2000-07-07 EP EP00943410A patent/EP1214368B1/fr not_active Revoked
- 2000-07-07 DE DE60040549T patent/DE60040549D1/de not_active Expired - Lifetime
- 2000-07-07 AU AU57885/00A patent/AU5788500A/en not_active Abandoned
- 2000-07-07 US US09/611,498 patent/US6355845B1/en not_active Expired - Lifetime
- 2000-07-07 AR ARP000103501A patent/AR025851A1/es unknown
- 2000-07-07 KR KR1020027000271A patent/KR20020030779A/ko not_active Application Discontinuation
- 2000-07-07 CO CO00051051A patent/CO5160376A1/es unknown
- 2000-07-07 WO PCT/US2000/018620 patent/WO2001004178A1/fr active Application Filing
- 2000-07-07 MX MXPA02000298A patent/MXPA02000298A/es unknown
- 2000-07-07 BR BR0011792-7A patent/BR0011792A/pt not_active IP Right Cessation
- 2000-07-07 CN CNB008098255A patent/CN100391999C/zh not_active Expired - Fee Related
- 2000-07-07 CA CA002376034A patent/CA2376034A1/fr not_active Abandoned
- 2000-07-07 AT AT00943410T patent/ATE411350T1/de not_active IP Right Cessation
- 2000-07-07 JP JP2001509784A patent/JP2003534392A/ja active Pending
Also Published As
Publication number | Publication date |
---|---|
EP1214368A1 (fr) | 2002-06-19 |
CA2376034A1 (fr) | 2001-01-18 |
DE60040549D1 (de) | 2008-11-27 |
BR0011792A (pt) | 2002-03-12 |
AR025851A1 (es) | 2002-12-18 |
CO5160376A1 (es) | 2002-05-30 |
KR20020030779A (ko) | 2002-04-25 |
JP2003534392A (ja) | 2003-11-18 |
US6355845B1 (en) | 2002-03-12 |
AU5788500A (en) | 2001-01-30 |
WO2001004178A1 (fr) | 2001-01-18 |
CN1359402A (zh) | 2002-07-17 |
CN100391999C (zh) | 2008-06-04 |
EP1214368B1 (fr) | 2008-10-15 |
ATE411350T1 (de) | 2008-10-15 |
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